forked from emscripten-core/emscripten
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathruntime_stack_check.js
More file actions
52 lines (48 loc) · 1.77 KB
/
runtime_stack_check.js
File metadata and controls
52 lines (48 loc) · 1.77 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
/**
* @license
* Copyright 2019 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
#if STACK_OVERFLOW_CHECK
// Initializes the stack cookie. Called at the startup of main and at the startup of each thread in pthreads mode.
function writeStackCookie() {
#if ASSERTIONS
assert((STACK_MAX & 3) == 0);
#endif
#if WASM_BACKEND
// The stack grows downwards
HEAPU32[(STACK_MAX >> 2)+1] = 0x2135467;
HEAPU32[(STACK_MAX >> 2)+2] = 0x89BACDFE;
#else
HEAPU32[(STACK_MAX >> 2)-1] = 0x2135467;
HEAPU32[(STACK_MAX >> 2)-2] = 0x89BACDFE;
#endif
#if !USE_ASAN
// Also test the global address 0 for integrity.
// We don't do this with ASan because ASan does its own checks for this.
HEAP32[0] = 0x63736d65; /* 'emsc' */
#endif
}
function checkStackCookie() {
#if WASM_BACKEND
var cookie1 = HEAPU32[(STACK_MAX >> 2)+1];
var cookie2 = HEAPU32[(STACK_MAX >> 2)+2];
#else
var cookie1 = HEAPU32[(STACK_MAX >> 2)-1];
var cookie2 = HEAPU32[(STACK_MAX >> 2)-2];
#endif
if (cookie1 != 0x2135467 || cookie2 != 0x89BACDFE) {
abort('Stack overflow! Stack cookie has been overwritten, expected hex dwords 0x89BACDFE and 0x2135467, but received 0x' + cookie2.toString(16) + ' ' + cookie1.toString(16));
}
#if !USE_ASAN
// Also test the global address 0 for integrity.
// We don't do this with ASan because ASan does its own checks for this.
if (HEAP32[0] !== 0x63736d65 /* 'emsc' */) abort('Runtime error: The application has corrupted its heap memory area (address zero)!');
#endif
}
#if !MINIMAL_RUNTIME // MINIMAL_RUNTIME moves this to a JS library function
function abortStackOverflow(allocSize) {
abort('Stack overflow! Attempted to allocate ' + allocSize + ' bytes on the stack, but stack has only ' + (STACK_MAX - stackSave() + allocSize) + ' bytes available!');
}
#endif
#endif